Why is my water not rendering nor in preview nor in final?
&quot;FLUID&quot; object is your actual Fluid Domain and it has 3 material slots assigned to it. First one is pure transparent material and this is why your fluid isn't visible. Remove &quot;TRANS&quot; and empty material and you are good to go.
Also, you have &quot;dOMAIN&quot; object which is doing nothing. Consider deleting it or hiding.